/*
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 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

import javax.mail.*;
import java.net.InetAddress;
import java.awt.*;
import javax.swing.*;

/**
 * Simple Authenticator for requesting password information.
 *
 * @author	Christopher Cotton
 * @author	Bill Shannon
 */
public class SimpleAuthenticator extends Authenticator {

    Frame frame;
    String username;
    String password;

    public SimpleAuthenticator(Frame f) {
        this.frame = f;
    }

    protected PasswordAuthentication getPasswordAuthentication() {

        // given a prompt?
        String prompt = getRequestingPrompt();
        if (prompt == null) {
            prompt = "Please login...";
        }

        // protocol
        String protocol = getRequestingProtocol();
        if (protocol == null) {
            protocol = "Unknown protocol";
        }

        // get the host
        String host = null;
        InetAddress inet = getRequestingSite();
        if (inet != null) {
            host = inet.getHostName();
        }
        if (host == null) {
            host = "Unknown host";
        }

        // port
        String port = "";
        int portnum = getRequestingPort();
        if (portnum != -1) {
            port = ", port " + portnum + " ";
        }

        // Build the info string
        String info = "Connecting to " + protocol + " mail service on host "
                + host + port;

        //JPanel d = new JPanel();
        // XXX - for some reason using a JPanel here causes JOptionPane
        // to display incorrectly, so we workaround the problem using
        // an anonymous JComponent.
        JComponent d = new JComponent() {
        };

        GridBagLayout gb = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();
        d.setLayout(gb);
        c.insets = new Insets(2, 2, 2, 2);

        c.anchor = GridBagConstraints.WEST;
        c.gridwidth = GridBagConstraints.REMAINDER;
        c.weightx = 0.0;
        d.add(constrain(new JLabel(info), gb, c));
        d.add(constrain(new JLabel(prompt), gb, c));

        c.gridwidth = 1;
        c.anchor = GridBagConstraints.EAST;
        c.fill = GridBagConstraints.NONE;
        c.weightx = 0.0;
        d.add(constrain(new JLabel("Username:"), gb, c));

        c.anchor = GridBagConstraints.EAST;
        c.fill = GridBagConstraints.HORIZONTAL;
        c.gridwidth = GridBagConstraints.REMAINDER;
        c.weightx = 1.0;
        String user = getDefaultUserName();
        JTextField username = new JTextField(user, 20);
        d.add(constrain(username, gb, c));

        c.gridwidth = 1;
        c.fill = GridBagConstraints.NONE;
        c.anchor = GridBagConstraints.EAST;
        c.weightx = 0.0;
        d.add(constrain(new JLabel("Password:"), gb, c));

        c.anchor = GridBagConstraints.EAST;
        c.fill = GridBagConstraints.HORIZONTAL;
        c.gridwidth = GridBagConstraints.REMAINDER;
        c.weightx = 1.0;
        JPasswordField password = new JPasswordField("", 20);
        d.add(constrain(password, gb, c));
        // XXX - following doesn't work
        if (user != null && user.length() > 0) {
            password.requestFocus();
        } else {
            username.requestFocus();
        }

        int result = JOptionPane.showConfirmDialog(frame, d, "Login",
                JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);

        if (result == JOptionPane.OK_OPTION) {
            return new PasswordAuthentication(username.getText(),
                    password.getText());
        } else {
            return null;
        }
    }

    private Component constrain(Component cmp,
            GridBagLayout gb, GridBagConstraints c) {
        gb.setConstraints(cmp, c);
        return (cmp);
    }
}
